| package inf_test |
| |
| import ( |
| "math/big" |
| "testing" |
| |
| "gopkg.in/inf.v0" |
| ) |
| |
| var decRounderInputs = [...]struct { |
| quo *inf.Dec |
| rA, rB *big.Int |
| }{ |
| // examples from go language spec |
| {inf.NewDec(1, 0), big.NewInt(2), big.NewInt(3)}, // 5 / 3 |
| {inf.NewDec(-1, 0), big.NewInt(-2), big.NewInt(3)}, // -5 / 3 |
| {inf.NewDec(-1, 0), big.NewInt(2), big.NewInt(-3)}, // 5 / -3 |
| {inf.NewDec(1, 0), big.NewInt(-2), big.NewInt(-3)}, // -5 / -3 |
| // examples from godoc |
| {inf.NewDec(-1, 1), big.NewInt(-8), big.NewInt(10)}, |
| {inf.NewDec(-1, 1), big.NewInt(-5), big.NewInt(10)}, |
| {inf.NewDec(-1, 1), big.NewInt(-2), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(-8), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(-5), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(-2), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(0), big.NewInt(1)}, |
| {inf.NewDec(0, 1), big.NewInt(2), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(5), big.NewInt(10)}, |
| {inf.NewDec(0, 1), big.NewInt(8), big.NewInt(10)}, |
| {inf.NewDec(1, 1), big.NewInt(2), big.NewInt(10)}, |
| {inf.NewDec(1, 1), big.NewInt(5), big.NewInt(10)}, |
| {inf.NewDec(1, 1), big.NewInt(8), big.NewInt(10)}, |
| } |
| |
| var decRounderResults = [...]struct { |
| rounder inf.Rounder |
| results [len(decRounderInputs)]*inf.Dec |
| }{ |
| {inf.RoundExact, [...]*inf.Dec{nil, nil, nil, nil, |
| nil, nil, nil, nil, nil, nil, |
| inf.NewDec(0, 1), nil, nil, nil, nil, nil, nil}}, |
| {inf.RoundDown, [...]*inf.Dec{ |
| inf.NewDec(1, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(1, 0), |
| inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}}, |
| {inf.RoundUp, [...]*inf.Dec{ |
| inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0), |
| inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1), |
| inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1), |
| inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}}, |
| {inf.RoundHalfDown, [...]*inf.Dec{ |
| inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0), |
| inf.NewDec(-2, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1), |
| inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1), |
| inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(2, 1)}}, |
| {inf.RoundHalfUp, [...]*inf.Dec{ |
| inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0), |
| inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1), |
| inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(0, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(0, 1), inf.NewDec(1, 1), inf.NewDec(1, 1), |
| inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}}, |
| {inf.RoundHalfEven, [...]*inf.Dec{ |
| inf.NewDec(2, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(2, 0), |
| inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-1, 1), |
| inf.NewDec(-1, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(1, 1), |
| inf.NewDec(1, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}}, |
| {inf.RoundFloor, [...]*inf.Dec{ |
| inf.NewDec(1, 0), inf.NewDec(-2, 0), inf.NewDec(-2, 0), inf.NewDec(1, 0), |
| inf.NewDec(-2, 1), inf.NewDec(-2, 1), inf.NewDec(-2, 1), |
| inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1)}}, |
| {inf.RoundCeil, [...]*inf.Dec{ |
| inf.NewDec(2, 0), inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(2, 0), |
| inf.NewDec(-1, 1), inf.NewDec(-1, 1), inf.NewDec(-1, 1), |
| inf.NewDec(0, 1), inf.NewDec(0, 1), inf.NewDec(0, 1), |
| inf.NewDec(0, 1), |
| inf.NewDec(1, 1), inf.NewDec(1, 1), inf.NewDec(1, 1), |
| inf.NewDec(2, 1), inf.NewDec(2, 1), inf.NewDec(2, 1)}}, |
| } |
| |
| func TestDecRounders(t *testing.T) { |
| for i, a := range decRounderResults { |
| for j, input := range decRounderInputs { |
| q := new(inf.Dec).Set(input.quo) |
| rA, rB := new(big.Int).Set(input.rA), new(big.Int).Set(input.rB) |
| res := a.rounder.Round(new(inf.Dec), q, rA, rB) |
| if a.results[j] == nil && res == nil { |
| continue |
| } |
| if (a.results[j] == nil && res != nil) || |
| (a.results[j] != nil && res == nil) || |
| a.results[j].Cmp(res) != 0 { |
| t.Errorf("#%d,%d Rounder got %v; expected %v", i, j, res, a.results[j]) |
| } |
| } |
| } |
| } |
